Clipping

Clipping

Use clip() to turn the current path into a clipping region, masking any graphics outside the path. clippreserve() keeps the current path, but also uses it as a clipping region. clipreset() resets it. :clip is also an action for drawing functions like circle().

sethue("grey50")
setdash("dotted")
circle(O, 100, :stroke)
circle(O, 100, :clip)
sethue("magenta")
box(O, 125, 200, :fill)

simple clip

Luxor.clipFunction.
clip()

Establish a new clipping region by intersecting the current clipping region with the current path and then clearing the current path.

Luxor.clippreserveFunction.
clippreserve()

Establish a new clipping region by intersecting the current clipping region with the current path, but keep the current path.

Luxor.clipresetFunction.
clipreset()

Reset the clipping region to the current drawing's extent.

This example uses the built-in function that draws the Julia logo. The clip action lets you use the shapes as a mask for clipping subsequent graphics, which in this example are randomly-colored circles:

julia logo mask

function draw(x, y)
    foregroundcolors = Colors.diverging_palette(rand(0:360), rand(0:360), 200, s = 0.99, b=0.8)
    gsave()
    translate(x-100, y)
    julialogo(action=:clip)
    for i in 1:500
        sethue(foregroundcolors[rand(1:end)])
        circle(rand(-50:350), rand(0:300), 15, :fill)
    end
    grestore()
end

currentwidth = 500 # pts
currentheight = 500 # pts
Drawing(currentwidth, currentheight, "/tmp/clipping-tests.pdf")
origin()
background("white")
setopacity(.4)
draw(0, 0)
finish()
preview()